It's an endless cycle of feeling fine and really happy to really depressed low and suicidal. Recently I've been fine and then suddenly this depression comes over me where I can't concentrate and I don't want to move or do anything and I feel so numb and empty. What is wrong with me? It's happened before and it's on and off but now it's bad again like about a year ago. I get upset over trivial things too. I don't get it. I get really angry too and end up throwing things and hurting people (with words) and myself (physically by pulling out my hair and scratching myself). I also can't sleep.